Abstract: A contour collimator for radiation therapy has a plurality of diaphragm elements that are movable with respect to each other by means of drive units. The diaphragm elements of the invention are supported only on the side near the drive units for ease of movement. This allows larger contour collimators to be constructed having relatively heavy diaphragm elements while retaining relatively small motors.

Abstract: The invention relates to a displacement-detecting element (1) comprising a measuring resistance (2), voltage source (3) and a displacement-dependent voltage pick off (4). The measuring resistance (2) is embodied in the form of a strip. The length of the resistor (6) corresponds to at least the maximal length of displacement (7) of the component to be detected. The invention also relates to a multileaf collimator (23) having such a displacement-detecting element (1). The aim of the invention is to produce a displacement-detecting element (a) for detecting the position of the leaves (22) in a multileaf collimator (23) in a precise and faultless manner.

Abstract: The invention relates to a displacement-detecting element (1) comprising a measuring resistance (2), voltage source (3) and a displacement-dependent voltage pick off (4). The measuring resistance (2) is embodied in the form of a strip. The length of the resistor (6) corresponds to at least the maximal length of displacement (7) of the component to be detected. The invention also relates to a multileaf collimator (23) having such a displacement-detecting element (1). The aim of the invention is to produce a displacement-detecting element (a) for detecting the position of the leaves (22) in a multileaf collimator (23) in a precise and faultless manner.

Abstract: The invention relates to a medical device having a mechanism (1) for positioning a devise (4) by means of an arm (7), said arm consisting of at least three members (8, 9, 10), wherein the mechanism (1) has at least five adjustment axes (11, 12, 13, 14, 15, 16), fine adjustment and locking devices (17) being assigned thereto. The medical device is configured in such a way that it can be used universally, especially as a device for stereotaxis that can be placed anywhere and that does not interfere with other medical measures and also as a position determining device that can be placed anywhere for determining the position of a patient (29). This is achieved in that the mechanism (1) has a base part (5) that can be fixed in any given location in the region of the patient (29) in such a way that the device (4) can reach all given target points (2) in or on the patient (29) in practically any direction (3).

Abstract: The radiation system has several radiation sources aimed toward a central point. These radiation sources are on arc element that pivots on an axis. The center can hence be irradiated from different sides. The radiation sources preferably have irregularly adjustable diaphragms. The system is suitable for irradiating any part of the human body. It is easy to manufacture and simple to used.